Refrigerator



FIG. 1 is a top, front, and left side perspective view of our design for a refrigerator;

FIG. 2 is a bottom view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a back side view thereof;

FIG. 8 is a front view thereof, where a front door, an upper inside door, and a lower inner door are open; and,

FIG. 9 is a perspective view thereof, where the front door and the upper inside door are open. 

We claim the ornamental design for a refrigerator, as shown and described. 